Used in a zombie invasion, a meat-shield is a individual who is viewed as obsolete or as a way to save their own ass by another individual, and they are promptly used as bait on an hoard of zombies at any given time. This technique is very effective in distracting the zombies, and since the meat-shield had no real purpose before, they are given a purpose to be yummy decoy.

Scenario: zombie invasion, wide scale and there is a small group of survivors. One of the survivors, named Steve, does not do jack to help the group and constantly pissing and moaning, making life even more aggrivating for the others.

Steve: #whining and bitching# I'm tired and hungry!! This sucks! I'm going to be the last survivor...Bitch, bitch, bitch, etc...
#hoard of zombies come running in#
Sam:#about to be attacked by a zombie# Meat shield!
#Group tosses Steve into the masses of zombies. He doesn't last long... And the rest of the group gets away and survives#

1. (noun) A Halo player whose key obligation is to run in front of or behind the player who is carrying the enemy's flag, with the objective of using his/her "meaty" body to stop the bullets from reaching their target.